Electromagnetic device.



H. P. CLAUSBN'.

ELECTROMAGNETIC DEVICE.

APPLICATION nun IA! 25, 1911.

Patented .3, 19%

N E w H. A K N. P mm IN E H A110 RNE'Y.

ms runs. In: .uvn. 1mm. 11..

UNITED STATES PATENT OFFICE.

HENRY P. CLAUSEN, OF ROCHESTER, NEW YORK, ASSIGNOR TO STROMBERG-CARL SONTELEPHONE MANUFACTURING COMPANY, OF ROCHESTER, NEW

PORATION OF NEW YORK.

YORK, A COR ELECTROMAGNETIC DEVICE.

To all whom it may concern Be it known that I, HENRY P. CLAUSEN, acitizen of the United States, and resident of Rochester, county oflVIonroe, State of New York, have invented certain new and usefulImprovements in Electromagnetic Devices, of which the following is aspecification. I

My invention relates to electro-magnetic devices, known as telephonerelays and used for the purpose of controlling the current in onecircuit through the agency of the current in other circuits.-

This is a division of my application, Serial No. 364,460, filed March25, 1907.

The object of the invention is to provide a relay having one coil ofhigh magnetic efficiency for initially actuating the relay, and anothercoil of low magnetic efiiciency, inexpensive to construct andhaving asmall winding space for mamtammg the relay in actuated condition. Relaysof this kind are useful in telephone circuits of various kinds in whichit is desirable to lock the relay in its actuated'position, and areespeciallyvaluable where the initially actuating coil is subject toalternations 1n the current direction, the magnetic circuit pf thisrelayrbeing such that alternations 1n the circuit of the larger coil donot demagnetize the smaller coil.

My invention is illustrated in the accompanying drawing, in which I haveshown a mechanical embodiment.

The embodiment of my invention comprises a U-shaped frame 1, of magneticmaterial', between'the limbs of which the magnetic core 2 is secured. Asecond magnetlc core 3 is secured beneath the lower limb of the U-shapedframe,'both cores being adapted to act upon the armature Th1s armatureis supported upon knife edges formed in the angle piece 5 and restingupon the.

projections Gextending from the end of the upper limb of the U-shapedmember 1. The rearwardly extending limb of this angle 5 engages theswitch springs 7 which are adapted to open and close the secondarySpecification of Letters Patent.

Original application filed March 25, 1907, Serial No. 364,460,

Patented Mar. 3,1914.

Divided and this application filed May 25,

Serial No. 629.296.

circuit in a manner well known. The main core 2 is surrounded by a coil8, the wires of which are connected to the terminals 9 and 10, and thecore 3 is surrounded by coil 11, the wires of which are connected toterminals 12. The cores are preferably removably secured to the U-shaped member, though they may be made an integral part thereof ifdesired.

In the operation of my device the magnetization of the main core 2 bythe passage of current through the coil 7 sets up magnetic lines whichflow throughthe core 2, the armature 4 and the two limbs of the U-shapcdmember 1. The flow of current through the coil 11 magnetizes its core 3and produces magnetic lines through the core 3, the lower. end ofarmature 4 and the lower limb of the U-shaped member 1. Of course aportion of the magnetism produced by the main coil 8 is-carried throughthe core 3 and a portion of the magnetism produced by the auxiliary coil11 is carried through the core 2, but these portions are so slight as tobe practically negligible in the operation of the device.

IVhileI have shown and described my invention with respect to certaindetails here in illustrated, it is to be understood that I do not wishto be unduly limited thereto, many modifications being possible withoutdeparting from the spirit or scope of my invention.

I claim a 1. In an electro-magnetic device, a U- shaped frame ofmagnetic material, an electro-magnet within said frame, the ends of saidframe and the end of the electromagnet core forming the poles of saidmagnet, an armature for said magnet extending across said frame and anauxiliary magnet circuit for each core, a second strip of mag- Signedby' me at Rochester, county of netic material forming a return magneticMonroe, and State of New York, in the circuit for one core, and anarmature suppresence of two witnesses. ported thereon in position to besimilarly HENRY P. CLAUSEN.

5 actuated by the magnetization of either or l/Vitnesses:

both cores in either the same or opposite JOHN A. TAGGART,

polarity. CHARLES E. HAGUE.

